Set correct IR origins for inc/dec operations

NB: in order to produce correct IR origins, the source element kinds for
some FIR elements has been changed. As a side effect, mapping PSI to FIR
slightly changed: namely, for `a[b]++`, `a[b]` used to be mapped on
`set` call or callable reference, but now it is mapped on `get` call.

^KT-61891: Fixed
^KT-64387: Fixed

compiler/testData/ir/irText/lambdas/localFunction.fir.ir.txt

@@ -1,16 +0,0 @@
-FILE fqName:<root> fileName:/localFunction.kt
-  FUN name:outer visibility:public modality:FINAL <> () returnType:kotlin.Unit
-    BLOCK_BODY
-      VAR name:x type:kotlin.Int [var]
-        CONST Int type=kotlin.Int value=0
-      FUN LOCAL_FUNCTION name:local visibility:local modality:FINAL <> () returnType:kotlin.Unit
-        BLOCK_BODY
-          TYPE_OP type=kotlin.Unit origin=IMPLICIT_COERCION_TO_UNIT typeOperand=kotlin.Unit
-            BLOCK type=kotlin.Int origin=POSTFIX_INCR
-              VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:kotlin.Int [val]
-                GET_VAR 'var x: kotlin.Int declared in <root>.outer' type=kotlin.Int origin=null
-              SET_VAR 'var x: kotlin.Int declared in <root>.outer' type=kotlin.Unit origin=POSTFIX_INCR
-                CALL 'public final fun inc (): kotlin.Int declared in kotlin.Int' type=kotlin.Int origin=null
-                  $this: GET_VAR 'val tmp_0: kotlin.Int declared in <root>.outer.local' type=kotlin.Int origin=null
-              GET_VAR 'val tmp_0: kotlin.Int declared in <root>.outer.local' type=kotlin.Int origin=null
-      CALL 'local final fun local (): kotlin.Unit declared in <root>.outer' type=kotlin.Unit origin=null

compiler/testData/ir/irText/lambdas/localFunction.fir.kt.txt

@@ -1,13 +0,0 @@
-fun outer() {
-  var x: Int = 0
-  local fun local() {
-    { // BLOCK
-      val tmp_0: Int = x
-      x = tmp_0.inc()
-      tmp_0
-    } /*~> Unit */
-  }
-
-  local()
-}
-

compiler/testData/ir/irText/lambdas/localFunction.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 fun outer() {
     var x = 0
     fun local() { x++ }